JP2019214896A - Overtopping wave suppressing device - Google Patents

Abstract

To provide an overtopping wave suppressing device capable of suppressing overtopping wave flow rate in a revetment and the like with a simple structure.SOLUTION: A wave suppressing member 2 including a protection portion 3 that is softer than a water facing wall face 10 on a surface is disposed along the water facing wall face 10 other than a mooring wharf. The wave suppressing member 2 is connected to the water facing wall face 10 by a mooring rope 5 which restricts the wave suppressing member 2 within a predetermined vertical range of the water facing wall face 10 and hangs so as to be floatable. A lower end position of the predetermined vertical range is set to be upper than a water surface WL of a water area which the water facing wall face 10 faces.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an overtopping suppression device, and more particularly, to an overtopping suppression device capable of suppressing an overtopping flow rate at a seawall or the like while having a simple configuration.

  Due to the effects of rising water levels due to global warming and the enlargement of typhoons, there is an increasing risk of overtopping disasters, even at seawalls where no overtopping has occurred. Therefore, conventionally, as an overtopping countermeasure, an improved method has been proposed in which a structure such as a wall or a breakwater block that newly receives waves by concrete or the like is added to the existing seawall (for example, see Patent Document 1).

  However, in the method of increasing the seawall by adding a larger structure to the existing seawall as in the improvement method described in Patent Document 1, a large amount of labor and cost are required because large-scale construction is required. Required. In addition, there is a demerit that applying this measure impairs the landscape when viewing the offshore from the land side.

JP-A-2017-186759

  An object of the present invention is to provide an overtopping suppression device which has a simple configuration and can suppress an overtopping flow rate at a seawall or the like.

  In order to achieve the above object, a wave overtopping suppression device according to the present invention is provided with a wave suppression member arranged along a waterfront wall other than a mooring shore, and the wave suppression member can be floated by regulating the wave suppression member to a predetermined vertical range of the waterfront wall. A mooring line suspended from the surface of the wave suppressing member, the surface of the wave suppressing member has a protection portion softer than the water surface, the lower end of the predetermined vertical range, the water surface of the water surface facing the water surface It is characterized in that it is set above.

  ADVANTAGE OF THE INVENTION According to this invention, when the high wave which overtopping hits the water wall, the force of the wave which tries to get over the water wall is suppressed by the weight of the wave suppressing member arranged along the water surface. Is done. The mooring line connecting the wave suppressing member to the water wall is tensioned, and the wave resistance member resists the wave, thereby suppressing the wave force. Since the wave suppressing member is restricted to a predetermined vertical range of the waterfront by the mooring line, the wave suppressing effect of the wave suppressing member and the mooring line can be continuously exerted. Therefore, it is possible to suppress the overtopping flow rate on the water surface while having a very simple configuration. In addition, since the surface of the wave suppression member has a protection portion that is softer than the water surface, the water surface can be prevented from being damaged even if the wave suppression member impacts the water surface.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which illustrates embodiment of the overtopping suppression apparatus of this invention typically by a side view. FIG. 2 is a view as viewed from an arrow A in FIG. 1. FIG. 2 is an explanatory view schematically illustrating a situation where a wave hits a water surface in FIG. 1 in a side view. It is explanatory drawing which illustrates another embodiment of this invention typically by a front view. It is explanatory drawing which illustrates still another embodiment of this invention typically by a side view. It is explanatory drawing which illustrates typically the wave making experimental apparatus which installed the wave overtopping suppression apparatus by a side sectional view. FIG. 7 is a graph illustrating a relationship between a significant wave height of a wave generated in the wave making experiment of FIG. 6 and a reduction rate of an overtopping flow rate by an overtopping suppression device. FIG. 7 is an explanatory view schematically exemplifying a wave overtopping suppression device and wave conditions in the wave making experiment of FIG. 6 in a side view.

  Hereinafter, an overtopping suppression device of the present invention will be described based on an embodiment shown in the drawings.

  The wave overtopping suppression device 1 of the present invention exemplified in FIGS. 1 to 3 includes a wave suppression member 2 arranged along a waterfront wall 10 other than a mooring shore, and the wave suppression member 2 in a predetermined vertical range of the waterfront wall 10. And a mooring line 5 that is suspended in a regulated and freely movable manner. The waterfront wall 10 on which the overtopping suppression device 1 is installed can be exemplified by a seawall, a lake, a river, or the like where a ship does not berth.

  In the drawings of the present application, an arrow X indicates a horizontal direction along the water surface 10 (extending direction of the water surface 10), an arrow Y indicates a horizontal direction perpendicular to the X direction (a normal direction to the water surface 10), and an arrow Z indicates a vertical direction. Indicated by. In FIG. 1, the state where the wave suppression member 2 is located at the lowest position and the state where the wave suppression member 2 is located at the uppermost position are indicated by solid lines and broken lines, respectively. In this embodiment, the vertical water surface 10 is illustrated, but the overtopping suppression device 1 of the present invention can also be adopted when the water surface 10 is an inclined surface or a curved surface.

The wave suppression member 2 is formed of, for example, a synthetic resin, a natural resin, a metal, or the like, and a member having a specific gravity of 1 or more or a member having a specific gravity of less than 1 can be used. Considering the handling and interference with the water surface 10,
The wave suppression member 2 is preferably a member having a specific gravity of less than 1, such as resin, rubber, or a foam thereof. Examples of the shape of the wave suppression member 2 include a columnar shape, a cylindrical shape, a bale shape, a spherical shape, and a polygonal column shape.

  The wave suppression member 2 has a protection portion 3 that is softer than the water surface 10 on the surface. The whole of the wave suppressing member 2 may be made of a material softer than the water surface 10 to have the protection portion 3 or the specification having the protection portion 3 only at the surface portion in contact with the water surface 10. . For example, the core of the wave suppression member 2 may be made of a material harder than the water surface 10, and the outer surface of the core may be covered with a material (rubber, soft resin, or the like) softer than the water surface 10. It is also possible to adopt a structure in which a protrusion formed of a material softer than the water surface 10 is provided on the outer periphery of the material.

  The wave suppressing member 2 may be formed in a bag shape like a pneumatic fender, and may have a structure in which air or water is injected into the inner space. In addition, since the overtopping suppression device 1 of the present invention is installed in a place where a ship does not berth, the installation place is completely different from that of the fender. The wave suppression member 2 is not limited to a completely water-impermeable structure as long as the structure has low water permeability, and may be a net-like structure or a structure in which a fibrous or string-like member is wound around a core material. You can also.

  The mooring line 5 is composed of a rope or a chain formed of a synthetic resin, a natural fiber, a metal, or the like. The mooring line 5 can also be designed to have a protective portion that is softer than the water surface 10 on the surface. In this embodiment, a mooring line 5 is inserted into a through hole 4 extending in the axial direction of the cylindrical wave suppressing member 2, and both ends of the mooring line 5 are fixed to the water surface 10. 6. Examples of the fixing tool 6 include a driving anchor bolt, a fastening anchor bolt, and a chemical anchor bolt. The method of connecting the wave suppression member 2 and the mooring line 5 and the method of fixing the mooring line 5 to the water surface 10 are not particularly limited, and other configurations can be adopted.

  The lower end position of the predetermined vertical range in which the wave suppressing member 2 regulated by the mooring line 5 can float is set above the water surface WL of the water area where the waterfront wall surface 10 faces. Specifically, when the waterfall wall 10 faces the sea or a river near the mouth of the sea, the lower end position of the above-mentioned predetermined upper and lower range is an average value of the average low tide level and the average high tide level. Or higher than the average high tide level. When the water surface 10 faces the lake, the lower end position of the above-described predetermined vertical range is set to a position higher than the average water level of the lake. That is, as shown in FIGS. 1 and 2, in a normal state where there is no wave due to a typhoon, a strong wind, or the like, the wave suppression member 2 is suspended at a position higher than the water surface WL and does not contact the water surface WL.

As shown in FIG. 1, the length of the mooring line 5 is determined in a state where the wave suppression member 2 is located at the lowest position.
The angle θ between the normal direction (Y direction) to the water surface 10 and the mooring line 5 may be set to a length that is 30 degrees or more and 60 degrees or less, and more preferably 40 degrees or more and 50 degrees or less. The upper end position of the predetermined upper / lower range in which the wave suppressing member 2 can float is appropriately determined according to the assumed wave height of the wave hitting the waterfront wall surface 10, and in this embodiment, is set at the same height position as the upper end of the waterfront wall surface 10. Have been. Since it is not desirable to make the wave suppressing member 2 protrude from the water surface 10 in bad weather when overtopping occurs, the upper end position of this vertical range may be set to be equal to or less than the upper end position of the water surface 10. As shown in FIG. 2, in this embodiment, a plurality of wave suppression members 2 are arranged in the X direction, but an appropriate number (single or plural) is set based on the conditions of the installation site.

  As shown in FIG. 3, when a wave W higher than the water surface WL hits the water surface 10 in bad weather or the like, the wave W collides with the wave suppression member 2. At this time, the force of the wave W trying to get over the waterfront wall surface 10 is suppressed by the weight of the wave suppression member 2. Further, the mooring cable 5 connecting the wave suppressing member 2 to the water surface 10 is tensioned and the wave resistance member 2 resists the wave W, so that the force of the wave W trying to get over the water surface 10 is suppressed. You. Since the wave suppressing member 2 is restricted to a predetermined vertical range of the waterfront wall 10 by the mooring line 5, the effect of suppressing the wave W by the wave suppressing member 2 and the mooring line 5 is continuously exhibited. Therefore, the overtopping flow rate on the water surface 10 is suppressed.

  As described above, the overtopping suppression device 1 of the present invention can suppress the overtopping flow rate at the water wall 10 while having a very simple configuration. Since the surface of the wave suppression member 2 has the protection part 3 which is softer than the water surface 10, it is possible to prevent the water surface 10 from being damaged even when the wave surface 2 impacts the water surface 10. Further, the overtopping wave suppression device 1 can be installed on the existing waterfront wall surface 10 with relatively simple construction.

  The relationship between the weight (specific gravity) of the wave suppressing member 2 and the wave power (wave height) with respect to the effect of suppressing the overtopping flow rate is as follows.

  When the specific gravity of the wave suppressing member 2 is increased, the effect of suppressing the force of the wave W by the weight of the wave suppressing member 2 increases. The wave suppression member 2 receives the force of the wave W and moves within the range restricted by the mooring cable 5, but the greater the specific gravity of the wave suppression member 2, the more difficult the wave suppression member 2 to move. When the wave height of the wave W hitting the waterfront surface 10 is relatively low and the specific gravity of the wave suppressing member 2 is considerably large, the wave suppressing member 2 almost moves from the lower end position of the predetermined vertical range regulated by the mooring line 5. Instead, the wave stay member 2 stays at a position close to the water surface 10, so that the wave suppression member 2 effectively suppresses the launch of the wave W near the water surface 10. Therefore, when the specific gravity of the wave suppressing member 2 is considerably increased, the effect of suppressing the overtopping flow rate for the wave W having a relatively low wave height is increased.

  On the other hand, when the wave height of the wave W hitting the water surface 10 is relatively high, if the specific gravity of the wave suppressing member 2 is considerably large, the wave suppressing member 2 is unlikely to move upward together with the rising wave W. A small overtopping may occur, slipping over 2. Therefore, when the specific gravity of the wave suppressing member 2 is considerably increased, the effect of suppressing the overtopping flow rate for the wave W having a relatively high wave height decreases.

  When the specific gravity of the wave suppressing member 2 is reduced, the wave suppressing member 2 can easily move in a range restricted by the mooring line 5. Therefore, when the wave height of the wave W that hits the water surface 10 is relatively low and the specific gravity of the wave suppressing member 2 is considerably small, the wave suppressing member 2 moves from the lower end position of the predetermined vertical range regulated by the mooring line 5. As a result, a gap is likely to be formed between the water surface 10 and the wave suppressing member 2, and the wave W launched from the clearance may overflow the water surface 10. Therefore, when the specific gravity of the wave suppressing member 2 is considerably reduced, the effect of suppressing the overtopping flow rate for the wave W having a relatively low wave height decreases.

  On the other hand, when the wave height of the wave W hitting the water surface 10 is relatively high, if the specific gravity of the wave suppressing member 2 is considerably small, the wave suppressing member 2 can easily move upward together with the rising wave W. Therefore, the mooring line 5 is strained, and the wave suppressing member 2 resists the wave W rising from above, thereby effectively suppressing the wave W from rising. Therefore, when the specific gravity of the wave suppressing member 2 is considerably reduced, the effect of suppressing the overtopping flow rate for the wave W having a relatively high wave height increases.

  As described above, the effect of suppressing the overtopping flow rate differs depending on the relationship between the weight (specific gravity) of the wave suppressing member 2 and the force of the wave (wave height). Is adopted. The wave overtopping suppression device 1 can be installed on various waterfront surfaces 10 by changing the size, shape, number of arrangement, and the like of the wave suppression members 2 according to the size and shape of the waterfront surface 10. In addition, by changing the magnitude of the specific gravity and the installation height of the wave suppressing member 2, it is possible to cope with waves having various wave heights, so that the versatility is very high.

  When the length of the mooring cable 5 is set such that the wave suppression member 2 is located at the lowest position, the angle θ between the normal direction (Y direction) to the waterfront wall surface 10 and the mooring cable 5 is set to 30 degrees or more and 60 degrees or less. When the length is set to a certain value, the gap between the water-supply wall surface 10 and the wave-suppression member 2 when the wave-suppression member 2 moves up and down can be reduced. To be advantageous. Further, when the length of the mooring line 5 is set to a length at which the angle θ is 40 degrees or more and 50 degrees or less, it is more advantageous to suppress the launch of the wave W near the water surface 10.

  As illustrated in FIGS. 4 and 5A to 5D, the overtopping wave suppressing device 1 has a configuration in which a plurality of wave suppressing members 2 are arranged in a vertical direction, and the wave suppressing member 2 includes a plurality of members. It is also possible to form a configuration formed in combination.

  In the overtopping wave suppression device 1 illustrated in (a) of FIGS. 4 and 5, the plurality of wave suppression members 2 are arranged in the vertical direction, and are arranged adjacent to each other in the horizontal direction along the water surface 10 in plan view. The upper wave suppression member 2 is disposed at a position that closes a gap between the lower wave suppression members 2.

  In this embodiment, the columnar wave suppression members 2 are arranged along the water surface 10 in such a direction that the column axis direction is parallel to the X direction. The connecting tools 7 are respectively attached to the center positions. One end of the mooring line 5 is detachably connected to each of the connecting members 7, and the other end of the mooring line 5 is detachably connected to a fixing device 6 fixed to the water surface 10.

  When a plurality of wave suppression members 2 are arranged in the vertical direction in this way, it is possible to cope with waves of various wave heights hitting the water surface 10 by the wave suppression members 2 and the mooring lines 5 having different installation heights. This is advantageous for reducing the overtopping flow rate. Further, when the upper wave suppression member 2 is disposed at a position that closes a gap between the lower wave suppression members 2 disposed adjacent to each other in the horizontal direction along the water surface 10 in plan view, the lower side Even when the wave W is launched from a gap between the wave suppression members 2, the wave W can be suppressed by the upper wave suppression member 2, which is more advantageous in suppressing the overtopping flow rate.

  As described above, it is advantageous to increase the specific gravity of the wave suppressing member 2 in order to suppress the overtopping flow due to the wave W having a relatively low wave height, and to suppress the overtopping flow due to the wave W having a relatively high wave height. It is advantageous to reduce the specific gravity of the wave suppressing member 2. Therefore, by arranging a plurality of wave suppression members 2 having different specific gravities in the vertical direction, it becomes possible to cope with waves having various wave heights hitting the waterfront wall surface 10, so that it is more necessary to reduce the overtopping flow rate at the waterfront surface 10. It will be advantageous.

  Furthermore, when the specific gravity of the wave suppressing member 2 arranged on the upper side is set smaller than the specific gravity of the wave suppressing member 2 arranged on the lower side, the wave height is compared by the wave suppressing member 2 arranged on the lower side and having a relatively large specific gravity. The overtopping flow caused by the extremely low wave W can be effectively suppressed, and the overtopping flow caused by the wave W having a relatively high wave height can be effectively suppressed by the wave suppressing member 2 having a relatively small specific gravity arranged on the upper side. Therefore, it becomes more and more advantageous to suppress the overtopping flow rate on the water surface 10.

  In the embodiment illustrated in FIGS. 5B to 5D, the main member 2a in which the wave suppressing member 2 is connected to the mooring line 5 and the main member 2a are connected to the main member 2a by a connecting member 2c different from the mooring line 5. Sub-member 2b. In this embodiment, the main member 2a and the sub member 2b are formed of columnar members, but may have other shapes. The materials, installation conditions, and the like of the wave suppressing member 2 and the mooring line 5 are the same as those in the above-described embodiment.

  In the overtopping suppression device 1 of FIG. 5B, connecting members 7 are provided on both end surfaces of the columnar main member 2 a, respectively, and each of the connecting members 7 and the fixing member 6 fixed to the water surface 10. Are connected by a mooring line 5. The main member 2a and the columnar sub-member 2b disposed adjacent to and below the main member 2a are connected by a flexible cable-like connecting member 2c. The connecting member 2c may have the same specifications as the mooring line 5.

  In the overtopping suppression device 1 of FIG. 5C, a main member 2a and a sub-member 2b disposed adjacent to and below the main member 2a instead of the cord-like connecting member 2c of FIG. They are connected by a rigid rod-shaped connecting member 2c having no flexibility. Other configurations are the same as those of the overtopping suppression device 1 of FIG.

  In the overtopping suppression device 1 shown in FIG. 5D, the main member 2a and the vertical direction (Y direction) of the water surface 10 of the main member 2a are used instead of the cord-like connecting member 2c shown in FIG. 5B. Is connected to a sub-member 2b disposed adjacent to the base member by a rigid rod-shaped connecting member 2c having no flexibility. Other configurations are the same as those of the overtopping suppression device 1 of FIG.

  When the wave suppressing member 2 is composed of the main member 2a, the sub member 2b, and the connecting member 2c as in the embodiments illustrated in FIGS. 5B to 5D, the wave suppressing member 2 is moved by the main member 2a and the sub member 2b. The energy of the wave W is absorbed by the interference, tension, deformation, and the like of the connecting member 2. Therefore, it is advantageous to increase the effect of suppressing the overtopping flow rate.

  If the main member 2a and the sub member 2b are set to have different specific gravities even when the wave suppressing member 2 is composed of the main member 2a, the sub member 2b, and the connecting member 2c, the waves W having various wave heights can be set by one wave suppressing member 2. This is advantageous for suppressing the overtopping flow rate on the water surface 10. In the embodiment illustrated in FIGS. 5B to 5D, the case where one sub-member 2b is connected to the main member 2a is illustrated, but two or more sub-members are connected to the main member 2a. A configuration in which the members 2b are connected may be employed.

  As shown in FIG. 6, a reduced model 21 simulating the waterfront wall 10 and the wave suppression device 1 was installed in the wave-making section of the wave-making experiment device 20, and the effect of suppressing the wave overtopping flow by the wave-overtopping suppression device 1 was confirmed. In this experiment, the water collecting box 22 divided into a plurality of sections is installed on the downstream side of the water surface 10 (reduced model 21), and the wave suppression member 2 (2H) having a large specific gravity is installed. The overtopping flow rate was measured for each of three cases where the wave suppression member 2 (2L) was installed and where the overtopping suppression device 1 was not installed. The wave suppression member 2H is formed of an acrylic resin and has a specific gravity of 0.509. The wave suppression member 2L having a small specific gravity is formed of styrene foam, and has a specific gravity of 0.066. The wave suppression members 2H and 2L are formed in a columnar shape and have the same dimensions.

  FIG. 7 is a graph showing the experimental results, in which the horizontal axis represents the significant wave height of the wave W generated by the wave making experiment apparatus 20, and the vertical axis represents the reduction rate of the overtopping flow rate due to the installation of the overtopping suppression apparatus 1. Is shown. The white square marks in FIG. 7 indicate the case where the wave suppression member 2H is installed, and the white circles indicate the experimental results when the wave suppression member 2L is installed. In FIG. 7, when the overtopping suppression device 1 is not installed, the reduction rate of the overtopping flow rate is 0%.

  As shown in FIG. 7, in the case where any of the wave suppression members 2 </ b> H and 2 </ b> L is employed, the wave overtopping suppression device 1 is installed on the waterfront wall 10, so that the wave overtopping suppression device 1 is not installed. It can be seen that the flow rate can be suppressed. In the case of the wave suppressing member 2H having a large specific gravity, the effect of suppressing the overtopping flow is high when the wave height is low, and in the case of the wave suppressing member 2L having a low specific gravity, the effect of suppressing the overtopping flow is high when the wave height is high. .

  FIG. 8A shows a state in which the wave suppression member 2H is installed to generate a wave SW having a low wave height (significant wave height is about 6.2 cm), and FIG. 8B shows a wave suppression member. 2H shows a situation in which a wave BW having a high wave height (significant wave height is about 14 cm) is generated by installing 2H. FIG. 8C shows a state in which a wave SW having a low wave height is generated by installing the wave suppressing member 2L, and FIG. 8D shows a wave BW having a high wave height by installing the wave suppressing member 2L. Shows the situation that caused.

  As shown in FIG. 8A, in the case of the wave suppressing member 2H, the wave suppressing member 2H is moved to the lower end of the upper and lower range regulated by the mooring line 5 for the wave SW having a relatively low wave height. The launch of the wave SW near the water surface 10 was suppressed by the wave suppressing member 2H that stayed near the water surface 10 without moving from the position. The overtopping flow rate was reduced by about 92% as compared with the case where the overtopping suppression device 1 was not installed.

  As shown in FIG. 8B, for the wave BW having a relatively high wave height, the wave suppressing member 2H has moved to a middle position in the upper and lower range regulated by the mooring line 5, but the upper part of the wave BW However, a small overtopping of the wave suppressing member 2H over the wave suppressing member 2H occurred without rising. The overtopping flow rate was reduced by about 77% compared to the case where the overtopping suppression device 1 was not installed.

  As shown in FIG. 8C, in the case of the wave suppression member 2 </ b> L, the wave suppression member 2 </ b> L is at the lower end of the upper and lower range regulated by the mooring line 5 for the wave SW having a relatively low wave height. Moving from the position, a gap was created between the water surface 10 and the wave suppressing member 2, and the wave was thinly launched from the gap, resulting in a small overtopping. However, compared with the case where the overtopping wave suppression device 1 was not installed, the momentum of the water flow over the watershed wall was weaker, and water was accumulated only in the section of the water collecting box 22 closest to the watershed wall. The overtopping flow rate was reduced by about 76% as compared with the case where the overtopping suppression device 1 was not installed.

  As shown in FIG. 8D, for a wave BW having a relatively high wave height, the wave suppressing member 2 </ b> L rises to the upper part of the wave BW launched near the waterfront wall surface 10, and the mooring line 5 is strained. The resistance of the wave suppressing member 2 to suppress the rising wave BW from above suppresses the rising of the wave BW. Although a small overtopping occurred, the force of the water flow over the water wall was weaker than when the overtopping suppression device 1 was not installed, and water did not accumulate in a section of the water collecting box 22 far from the water wall. The overtopping flow rate was reduced by about 91% as compared with the case where the overtopping suppression device 1 was not installed.

DESCRIPTION OF SYMBOLS 1 Overtopping wave suppression device 2, 2H, 2L Wave suppression member 2a Main member 2b Sub member 2c Connection member 3 Protection part 4 Through hole 5 Mooring cable 6 Fixture 7 Connection tool 10 Water surface 20 W, BW, SW wave WL Water surface of the water area where the waterfront wall faces

Claims (6)

A wave suppressing member arranged along a water surface other than the mooring shore, and a mooring line that suspends the wave suppressing member movably while restricting the wave suppressing member to a predetermined vertical range of the water surface,
The surface of the wave suppression member has a protection part softer than the water surface, and the lower end position of the predetermined vertical range is set higher than the water surface of the water area facing the water surface. Characterized overtopping suppression device.   The wave overtopping suppression device according to claim 1, wherein the wave suppression member has a columnar shape or a cylindrical shape.   3. The wave overtopping suppression device according to claim 1, wherein a plurality of said wave suppression members are arranged in a vertical direction.   4. The overtopping wave suppression device according to claim 3, wherein a specific gravity of the wave suppression member disposed on an upper side is smaller than a specific gravity of the wave suppression member disposed on a lower side. 5.   The upper wave suppression member is disposed at a position to close a gap between the lower wave suppression members disposed adjacent to each other in the horizontal direction along the water surface in plan view, 4. The overtopping suppression device according to 4.   The said wave suppression member is a main member connected to the mooring line, and this main member and the said mooring line are comprised with the sub member connected by another connection member. The overtopping suppression device according to the above.

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